Techniques for manufacturing and cooling three-dimensional objects

ABSTRACT

A method of manufacturing three-dimensional (3D) objects is provided. The method includes generating a plan for printing a plurality of 3D objects in a 3D printing medium at least in part by identifying an unprinted area of the 3D printing medium for insertion of a cooling device and determining where at least some of the plurality of 3D objects are to be printed in the 3D printing medium such that none of the at least some of the plurality of 3D objects, when printed, intersect the identified unprinted area for the insertion of the cooling device. The method further includes printing, using a 3D printer, the at least some of the plurality of 3D objects in accordance with the plan and, after the printing, inserting the cooling device into the unprinted area of the 3D printing medium and cooling the 3D printing medium using the cooling device.

RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 120 and is acontinuation of U.S. patent application Ser. No. 15/360,730, filed Nov.23, 2016, entitled “TECHNIQUES FOR MANUFACTURING AND COOLINGTHREE-DIMENSIONAL OBJECTS,” which is incorporated by reference in itsentirety.

FIELD

Aspects of the technology described herein relate to three-dimensional(3D) printing and processing of 3D printed objects. Some aspects relateto techniques for cooling a 3D printing medium containing 3D printedobjects.

BACKGROUND

Some three-dimensional ( 3D) printing techniques print an object bysuccessively forming a series of material layers in accordance with a 3Dmodel of the object to be printed. Some companies, such as SHAPEWAYS,provide on-demand 3D printing services where customers may upload custom3D models, select materials, and order printed objects to be built fromselected materials. These on-demand printing services allow customers toconvert a custom 3D model into any number of printed objects without theexpense of purchasing and operating a 3D printer.

SUMMARY

According to at least one aspect, a method of manufacturingthree-dimensional ( 3D) objects is provided. The method includesgenerating a plan for printing a plurality of 3D objects in a 3Dprinting medium at least in part by identifying at least one unprintedarea of the 3D printing medium for insertion of at least one coolingdevice and determining where at least some of the plurality of 3Dobjects are to be printed in the 3D printing medium such that none ofthe at least some of the plurality of 3D objects, when printed,intersect the identified at least one unprinted area for the insertionof the at least one cooling device. The method further includesprinting, using a 3D printer, the at least some of the plurality of 3Dobjects in accordance with the plan and, after the printing, insertingthe at least one cooling device into the at least one unprinted area ofthe 3D printing medium and cooling the 3D printing medium using the atleast one cooling device.

In some embodiments, the method further includes marking the identifiedat least one unprinted area using the 3D printer. In some embodiments,the method further includes identifying, after the printing and based onthe marking, at least one access point to the at least one unprintedarea of the 3D printing medium. In some embodiments, marking theidentified at least one unprinted area using the 3D printer includesprinting at least one 3D marking object on a surface of the 3D printingmedium. In some embodiments, generating the plan for printing theplurality of 3D objects includes determining where the at least one 3Dmarking object is to be printed on the surface of the 3D printingmedium.

In some embodiments, generating the plan for printing the plurality of3D objects includes determining a number of unprinted areas to includein the 3D printing medium. In some embodiments, determining the numberof unprinted areas includes determining the number of unprinted areas toinclude in the 3D printing medium based on a size of the 3D printingmedium. In some embodiments, determining the number of unprinted areasincludes determining the number of unprinted areas to include in the 3Dprinting medium based on a desired cooling time of the 3D printingmedium.

In some embodiments, the 3D printing medium includes quadrants andwherein identifying the at least one unprinted area of the 3D printingmedium includes identifying four unprinted areas, each of the fourunprinted areas located at a boundary between a respective pair of thequadrants. In some embodiments, inserting the at least one coolingdevice comprises vertically inserting a cooling device into each of thefour unprinted areas.

In some embodiments, the 3D printing medium includes quadrants andwherein identifying the at least one unprinted area of the 3D printingmedium includes identifying an unprinted area in a region of the 3Dprinting medium that spans at least two quadrants of the quadrants. Insome embodiments, the at least one cooling device comprises a firstcooling device and a second cooling device, wherein identifying the atleast one unprinted area of the 3D printing medium includes identifyinga first unprinted area that allows for vertical insertion of the firstcooling device and a second unprinted area that allows for horizontalinsertion of the second cooling device.

In some embodiments, the method further includes placing a brace on the3D printing medium after the printing. In some embodiments, insertingthe at least one cooling device includes inserting one cooling devicethrough the brace and into the 3D printing medium.

In some embodiments, printing the at least some of the plurality of 3Dobjects includes printing the at least some of the plurality of 3Dobjects in the 3D printing medium in a frame, the frame comprisingsidewalls and a tray coupled to the sidewalls. In some embodiments, themethod further includes removing the sidewalls from the frame afterprinting. In some embodiments, the method further includes wrapping atleast part of the 3D printing medium with a wrap after removing thesidewalls.

In some embodiments, the method further includes monitoring temperatureof the 3D printing medium and removing the at least some of theplurality of 3D printed objects from the 3D printing medium when thetemperature of the 3D printing medium is less than a thresholdtemperature. In some embodiments, the threshold temperature is 70degrees centigrade.

In some embodiments, the 3D printing medium comprises at least one ofNylon 11 and Nylon 12. In some embodiments, printing the at least someof the plurality of 3D objects is performed using selective lasersintering (SLS).

In some embodiments, the 3D printing medium comprises a powderedmaterial and wherein substantially all of the powdered material (e.g.,at least 90%, at least 95%, at least 99%, at least 99.9%, 100%) in theat least one unprinted area is not fused by the 3D printer during theprinting. In some embodiments, cooling the 3D printing medium using theat least one cooling device includes passing a fluid through the coolingdevice.

According to at least one aspect, a method of manufacturingthree-dimensional ( 3D) objects is provided. The method includesgenerating a plan for printing a plurality of 3D objects in a 3Dprinting medium and printing, using a 3D printer, at least some of theplurality of 3D objects in accordance with the plan. The method furtherincludes, after the printing, wrapping at least part of the 3D printingmedium with a wrap, inserting the at least one cooling device into the3D printing medium, and cooling the 3D printing medium using the wrapand the at least one cooling device.

In some embodiments, the wrap includes a cellophane plastic wrap. Insome embodiments, generating the plan includes identifying at least oneunprinted area of the 3D printing medium for insertion of at least onecooling device and determining where the at least some of the pluralityof 3D objects are to be printed in the 3D printing medium such that noneof the at least some of the plurality of 3D objects, when printed,intersect the identified at least one unprinted area for the insertionof the at least one cooling device. In some embodiments, inserting theat least one cooling device includes inserting the at least one coolingdevice into the at least one unprinted area of the 3D printing medium.In some embodiments, the method further includes marking the identifiedat least one unprinted area using the 3D printer. In some embodiments,the method further includes identifying, after the printing and based onthe marking, at least one access point to the at least one unprintedarea of the 3D printing medium.

In some embodiments, printing the at least some of the plurality of 3Dobjects is performed using selective laser sintering (SLS). In someembodiments, inserting the at least one cooling device into the 3Dprinting medium includes inserting the at least one cooling device intothe 3D printing medium after wrapping the at least part of the 3Dprinting medium with the wrap.

According to at least one aspect, a cooling system is provided. Thecooling system includes at least one cooling device configured to beinserted into a 3D printing medium and to remove heat from the 3Dprinting medium via a fluid, at least one brace configured to supportthe at least one cooling device in the 3D printing medium, and arefrigerator configured to be fluidly coupled to the at least onecooling device and to cool the fluid.

In some embodiments, the refrigerator is a heat exchanger that removesheat from the fluid (e.g., by transferring the heat from the fluid toair or other fluid). In some embodiments, the fluid comprises arefrigerant that changes from a liquid state to a gaseous state in therefrigerator. In some embodiments, the fluid comprises a liquidincluding water, propylene glycol, or water and propylene glycol. Insome embodiments, the at least one cooling device includes four coolingdevices and the at least one brace includes four braces, each of thefour braces being configured to support one respective cooling device ofthe four cooling devices in a substantially vertical position (e.g., ±20degrees, ±10 degrees, ±5 degrees, or ±2 degrees) in the 3D printingmedium. In some embodiments, the at least one brace is configured tosupport the at least some of the at least one cooling device in one of asubstantially vertical position (e.g., ±20 degrees, ±10 degrees, ±5degrees, or ±2 degrees) and a substantially horizontal position (e.g.,±20 degrees, ±10 degrees, ±5 degrees, or ±2 degrees) in the 3D printingmedium. In some embodiments, the at least one brace is configured tosupport two cooling devices in a horizontal position in the 3D printingmedium.

In some embodiments, the cooling device includes a tube having a firstportion to receive the fluid from the refrigerator and a second portionto provide the fluid to the refrigerator. In some embodiments, the tubeincludes a bend of approximately 180 degrees (e.g., ±20 degrees, ±10degrees, ±5 degrees, or ±2 degrees) between the first and secondportions of the tube. In some embodiments, the tube comprises copper andhas a diameter of approximately 0.25 inches (e.g., ±0.20 inches, ±0.10inches, ±0.05 inches, or ±0.01 inches). In some embodiments, the firstportion of the tube is twisted with the second portion of the tube. Insome embodiments, the cooling device includes a handle coupled to thetube.

In some embodiments, the cooling system includes a coolant line tofluidly couple the refrigerator to the at least one cooling device. Insome embodiments, the cooling device includes at least one fitting forfluidly coupling the cooling device to the coolant line. In someembodiments, the coolant line includes at least one flexible tube.

According to at least one aspect, a cooling device for cooling a 3Dprinting medium is provided. The cooling device includes a tubeconfigured for insertion into a 3D printing medium, the tube including afirst portion for receiving fluid, a second portion for providing thefluid, and an approximately 180 degree (e.g., ±20 degrees, ±10 degrees,±5 degrees, or ±2 degrees) bend between the first and second portions ofthe tube where the first portion of the tube is twisted with the secondportion of the tube. The cooling device further includes a handlecoupled to the tube and configured to ease insertion of the tube intothe 3D printing medium by a user.

In some embodiments, the cooling device further includes at least onefitting to fluidly couple the tube to a coolant line. In someembodiments, the tube comprises copper and has a diameter ofapproximately 0.25 inches (e.g., ±0.20 inches, ±0.10 inches, ±0.05inches, or ±0.01 inches). In some embodiments, the handle comprisesNylon. In some embodiments, the first portion of the tube is configuredto receive the fluid from a refrigerator and wherein the second portionof the tube is configured to provide the fluid to the refrigerator.

According to at least one aspect, a method of manufacturing a coolingdevice is provided. The method includes receiving a tube, bending thetube approximately 180 degrees (e.g., ±20 degrees, ±10 degrees, ±5degrees, or ±2 degrees), twisting a first portion of the tube with asecond portion of the tube, and attaching a handle to the tube.

In some embodiments, receiving the tube includes receiving a straightcopper tube. In some embodiments, bending the tube approximately 180degrees (e.g., ±20 degrees, ±10 degrees, ±5 degrees, or ±2 degrees)includes bending the tube approximately 90 degrees (e.g., ±10 degrees,±5 degrees, ±2.5 degrees, or ±1 degree), inserting water into the tube,freezing the water in the tube, and further bending the tubeapproximately 90 degrees (e.g., ±10 degrees, ±5 degrees, ±2.5 degrees,or ±1 degree) to yield a bend that is approximately 180 degrees (e.g.,±20 degrees, ±10 degrees, ±5 degrees, or ±2 degrees). In someembodiments, the method further includes printing the handle with a 3Dprinter. In some embodiments, the method further includes, aftertwisting the first portion of the tube with the second portion of thetube, heating the tube and melting a solder onto the tube.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects and embodiments will be described with reference to thefollowing figures. It should be appreciated that the figures are notnecessarily drawn to scale. Items appearing in multiple figures areindicated by the same or a similar reference number in all the figuresin which they appear.

FIG. 1A shows a cross-sectional view of an example frame includingprinted objects in a 3D printing medium, according to some embodimentsof the technology described herein;

FIG. 1B shows a top view of the example frame of FIG. 1A, according tosome embodiments of the technology described herein;

FIG. 2 shows an example print order processing system, according to someembodiments of the technology described herein;

FIGS. 3A-3D each show an example arrangement of unprinted areas on asurface of a 3D printing medium, according to some embodiments of thetechnology described herein;

FIG. 4 shows an example cooling system, according to some embodiments ofthe technology described herein;

FIG. 5 shows an example cooling device, according to some embodiments ofthe technology described herein;

FIG. 6A shows a side view of an example brace for a cooling device,according to some embodiments of the technology described herein;

FIG. 6B shows a top view of the example brace of FIG. 6A, according tosome embodiments of the technology described herein;

FIG. 7A shows a front view of another example brace for a coolingdevice, according to some embodiments of the technology describedherein;

FIG. 7B shows a side view of the example brace of FIG. 7A, according tosome embodiments of the technology described herein;

FIGS. 8A and 8B each show an example method of manufacturing 3D printedobjects, according to some embodiments of the technology describedherein;

FIG. 9 shows an example method of manufacturing a cooling device,according to some embodiments of the technology described herein; and

FIG. 10 is a block diagram of an example special-purpose computersystem, according to some embodiments of the technology describedherein.

DETAILED DESCRIPTION

Aspects of the technology described herein are directed to improvedon-demand printing processes. In an on-demand 3D printing process, aservice provider may receive a custom 3D model from a customer andschedule the custom 3D model to be built by a 3D printer, such as aselective laser sintering (SLS) 3D printer or a selective laser melting(SLM) 3D printer, in a 3D printing medium with one or more other 3Dmodels. For example, the 3D printing medium may be used to print 50-800objects. The 3D printing medium may be too hot to handle (e.g., 170degrees centigrade) upon the completion of the printing process.Conventional techniques for cooling the 3D medium include removing the3D printing medium from the 3D printer after printing completes andleaving the 3D printing medium on an open air rack to cool to a desiredtemperature for handling (e.g., 70 degrees centigrade). Once the 3Dprinting medium has cooled, the 3D printed objects in the 3D printingmedium are manually removed from the 3D printing medium for subsequentprocessing. Such conventional techniques are extremely time consumingand constitute a significant portion of the overall time required tofulfill a customer order. For example, the 3D printing medium may takemultiple days to cool to an appropriate temperature for handling.

Accordingly, the inventors have developed techniques for rapidly coolingthe 3D printing medium to reduce the overall time required to processcustomer orders. For example, in some embodiments, the print plans thatinstruct a 3D printer to print 3D objects in the 3D printing medium maybe specially designed to include one or more unprinted areas in the 3Dprinting medium. The unprinted area(s) may be adapted to receive one ormore cooling devices, such that the cooling device(s) may be insertedinto the 3D printing medium without damaging the 3D printed objectscontained therein. The cooling device(s) may remove heat from the 3Dprinting medium thereby reducing the time required to cool the 3Dprinting medium.

Some aspects of the technology described herein are related to a methodof printing a plurality of 3D objects in a 3D printing medium and,subsequently, cooling the 3D printing medium using a cooling system. Themethod may include generating a plan for printing a plurality of 3Dobjects in a 3D printing medium. The plan may be generated by, forexample, a print planner application being executed on a computer systemin communication with a 3D printer. The plan may include an indicationof where each 3D object is to be printed in the 3D printing medium.Generating the plan may include identifying at least one unprinted areaof the 3D printing medium for the insertion of at least one coolingdevice. For example, the unprinted area may be a column (or a row) thatextends from an external surface of the 3D printing medium into the 3Dprinting medium. The dimensions of the column may be selected such thata cooling device may be inserted into the 3D printing medium withoutdamaging the 3D printed objects in the 3D printing medium. After theunprinted areas have been identified in the 3D printing medium, thelocation of the plurality of 3D objects that are to be printed in the 3Dprinting medium may be determined such that none of the plurality of 3Dobjects, when printed, intersect the identified at least one unprintedarea for the insertion of the at least one cooling device. In this way,inserting a cooling device into an unprinted area will not damage any ofthe printed 3D projects in the 3D printing medium. The at least oneunprinted area in the 3D printing medium may be marked to easeidentification of the at least one unprinted area. For example, a markermay be printed on (or proximate) a surface of the 3D printing medium tomark an access point to an unprinted area. Marking of the at least oneunprinted area facilitates the insertion of a cooling device into themedium by providing an operator a visual cue for where to insert thecooling device.

Once the printing plan has been generated, the plan may be provided to a3D printer, such as an SLS printer or SLM printer, to print the objectsin the plan. The 3D printer may receive the plan and print 3D objects ina 3D printing medium in accordance with the received plan. Afterprinting, the 3D printing medium may be removed from the 3D printer andcooled.

In some embodiments, the 3D printing medium may be cooled by one or morecooling devices inserted into the unprinted areas in the 3D printingmedium. In these embodiments, the unprinted areas may be identified bylocating the markers 3D printed on (or proximate) a surface of the atleast one unprinted area. The markers may be removed from the 3Dprinting medium and braces may be placed at the same location as themarker. The braces may be configured to guide the insertion of thecooling devices into the 3D printing medium such that the coolingdevices enter the 3D printing medium at an angle that is approximatelyperpendicular (e.g., ±20 degrees, ±10 degrees, ±5 degrees, or ±2degrees) to a surface of the 3D printing medium that the cooling devicepenetrates. For example, a brace may include a guide coupled to a flangethat is configured to rest on a surface of the 3D printing medium. Thebrace may include a hole at the center of the guide that allows thecooling device to be inserted through the brace. Once the coolingdevices have been inserted into the 3D printing medium, the coolingdevices may be operated to cool the 3D printing medium. For example, thecooling devices may include a tube that is configured to circulate fluidthat is colder than the 3D printing medium to extract heat from the 3Dprinting medium. The fluid circulated through the cooling devices may becooled, for example, by using refrigeration techniques.

In some embodiments, in addition to or instead of cooling a 3D printingmedium by inserting one or more cooling devices into the 3D printingmedium, one or more other cooling techniques may be employed to expeditethe cooling of the 3D printing medium. For example, the inventors havedevised compression techniques to compress the 3D printing medium toremove at least a portion of the air trapped in the unfused medium ofthe 3D printing medium to allow heat to escape more easily from the 3Dprinting medium. Removing air trapped in the unfused medium decreasesthe cooling time required because the air trapped in the 3D printingmedium acts as an insulator and thereby slows the heat transfer betweenthe 3D printing medium and the ambient air.

Accordingly, in some embodiments, the 3D printing medium may be cooledafter printing by wrapping the 3D printing medium with a wrap tocompress the 3D printing medium. For example, the 3D printing medium maybe disposed on a tray coupled to sidewalls. In this example, thesidewalls may be removed to expose a majority of the 3D printing mediumand the exposed 3D printing medium may be wrapped with a wrap (e.g., aplastic wrap such as, for instance, a cellophane wrap). It should beappreciated that all or any portion of the 3D printing medium may bewrapped to compress the 3D printing medium. Cooling devices may beinserted into the 3D printing medium after wrapping the 3D printingmedium to further reduce the cooling time.

According to some aspects, a cooling system is disclosed herein that isconstructed to cool the 3D printing medium after printing. The coolingsystem may circulate a fluid through the 3D printing medium and cool thecirculating fluid to remove heat from the 3D printing medium. Thecooling system may include at least one cooling device configured to beinserted into a 3D printing medium that may be operated to remove heatfrom the 3D printing medium. For example, the cooling device may includea tube twisted in a spiral shape with an approximately 180 degree (e.g.,±20 degrees, ±10 degrees, ±5 degrees, or ±2 degrees) bend in the centerof the tube. In this example, the tube may be inserted into the 3Dprinting medium and a fluid may be circulated through the tube to coolthe 3D printing medium. The cooling system may further include at leastone brace configured to support the at least one cooling device coolingdevice in the 3D printing medium. For example, the brace may include aflange that rests on the 3D printing medium that is coupled to a guidewith a hole in the center. The hole in the center of the guide may beconfigured to allow insertion of the at least one cooling device throughthe hole and into the 3D printing medium. The guide may assist anoperator insert the cooling device into the 3D printing medium at anangle that is approximately perpendicular (e.g., ±20 degrees, ±10degrees, ±5 degrees, or ±2 degrees) to a surface of the 3D printingmedium that is penetrated by the cooling device.

In some embodiments, the cooling system may include a refrigeratorconfigured to be fluidly coupled to the at least one cooling device andto cool the fluid. In these embodiments, the refrigerator may receivewarm fluid from the at least one cooling device, cool the received warmfluid, and provide the cool fluid back to the at least one coolingdevice. The refrigerator may be, for example, a heat exchanging devicethat transfers heat from the fluid to the ambient air. Example heatexchanging devices include radiators and condenser coils. The coolingsystem may include a pump to circulate the fluid through the at leastone cooling device. For example, the pump may be part of therefrigerator or other part of the cooling system. In some examples, thefluid may be a liquid including at least one of water and propyleneglycol. In other examples, the fluid may be a refrigerant that changesstate between a liquid state and a gaseous state in the refrigerator aspart of the cooling process.

It should be appreciated that the embodiments described herein may beimplemented in any of numerous ways. Examples of specificimplementations are provided below for illustrative purposes only. Itshould be appreciated that these embodiments and thefeatures/capabilities provided may be used individually, all together,or in any combination of two or more, as aspects of the technologydescribed herein are not limited in this respect.

Some additive 3D printing techniques, such as SLS and SLM, may form 3Dprinted objects by fusing portions of a 3D printing medium together witha laser. The 3D printing medium may be in a powdered form that may befused through the application of heat by the laser. These 3D printerstypically receive a frame, load a 3D printing medium (e.g., a mediumconsisting of unfused powder) into the frame, and fire a laser at the 3Dprinting medium in the frame to fuse select portions of the 3D printingmedium. An example of such a frame, after printed objects have beenformed in the 3D printing medium, is shown by frame 100 in FIGS. 1A and1B. FIG. 1A illustrates a cross-sectional view of the frame 100 and FIG.1B illustrates a top view of the frame 100. As shown, the frame 100includes a tray 108 attached to sidewalls 106 and contains a 3D printingmedium 102 with 3D printed objects 104 interspersed in the 3D printingmedium 102. The 3D printing medium 102 in the frame 100 may comprise anyof a variety of materials such as metal, plastic, composite, sand, orany combination thereof. For example, the printing medium 102 mayinclude Nylon 11 and/or Nylon 12.

In some embodiments, the frame 100 may be used with a 3D printer tocreate the 3D printed objects 104 in the 3D printing medium 102. Inthese embodiments, an empty frame 100 (without the 3D printing medium102 and the 3D printed objects 104) may be loaded into the 3D printer.The 3D printer may load a layer of the 3D printing medium 102 into theframe 100 and use a laser to fuse portions of the 3D printing medium 102to form a portion of one or more printed objects 104. The laser may fusethe desired portions of the 3D printing medium 102 through theapplication of heat to targeted portions of the 3D printing medium 102.Once the appropriate portions of the layer of the 3D printing medium 102have been formed, the 3D printer may add an additional layer of the 3Dprinting medium 102 to the frame 100 and use the laser to fuse portionsof the 3D printing medium together. The 3D printer may fuse a portion ofthe 3D printing medium 102 in the additional layer to the previouslyfused 3D printing medium 102 in the previous layer to form printedobjects that extend through multiple layers of the 3D printing medium102. It should be appreciated that additional layers of 3D printingmedium 102 may be added to the frame 102 and fused with a laser to formthe 3D printed objects 104. Further, the thickness of each layer of 3Dprinting medium 102 added to the frame 100 may vary based on theparticular implementation.

The particular portions of each layer that are fused or left unfused maybe determined by the 3D printer in accordance with a print plan. Forexample, the print plan may include instructions for the 3D printerindicating the appropriate portions of the 3D printing medium 102 tofuse to form the desired 3D printed objects.

The 3D printing medium 102 in the frame 100 may be too hot to handleimmediately after the printing process completes. For example, the 3Dprinting medium 102 may be 170 degrees centigrade. Conventionally, theframe 100 was removed from the 3D printer and left on a rack to cool.Once the 3D printing medium 102 had cooled to an appropriatetemperature, the 3D printing medium 102 was removed from the frame 100and manually broken down to extract the 3D printed objects 104.

As described above, the inventors have appreciated that thisconventional cooling approach is very slow and have developed techniquesto reduce the cooling time required to cool the 3D printing medium 102and, thereby, reduce the amount of time between completion of theprinting and handling of the 3D printing medium 102 to extract the 3Dprinted objects 104.

In some embodiments, the cooling time required to cool the 3D printingmedium 102 may be reduced by inserting one or more cooling devices intothe 3D printing medium 102. These cooling devices may extract heat fromthe 3D printing medium 102 and, thereby, reduce the time required tocool the 3D printing medium 102. Simply inserting cooling devices intothe 3D printing medium 102, however, may damage the 3D printed objects104 in the 3D printing medium 102. For example, the cooling devices mayinclude a tube that is to be inserted into the 3D printing medium 102.An operator inserting the tube into the 3D printing medium 102 mayinadvertently hit and damage one or more printed objects 104 in the 3Dprinting medium 102 as the tube is being inserted. Accordingly, theinventors have devised techniques to create unprinted areas in the 3Dprinting medium 102 for safe insertion of a cooling device withoutdamaging the 3D printed objects 104. An example system that createsthese unprinted areas in the 3D printing medium 102 for safe insertionof a cooling device is shown in FIG. 2 by print order processing system200.

As shown in FIG. 2, the print order processing system 200 includes acomputer system 206 that is communicatively coupled to a 3D printer 208that is configured to print the 3D printed objects 104 in the 3Dprinting medium 102 in the frame 100. The computer system 206 includes aprint planner 210 that receives print orders 202 each including anindication of one or more objects to be printed by the 3D printer 208.In some embodiments, the print planner 210 may be implemented as acomputer program (e.g., an application program) that is executed by thecomputer system 206. The print planner 210 creates a print plan 204 forthe 3D printer 208 based on the received print orders 202 that instructsthe 3D printer 208 which portions of the 3D printing medium 102 to fuseand/or leave unfused. The print planner 204 may add an unprinted area212 in the print plan 204 such that a cooling device may be insertedinto the 3D printing medium 102 without damaging the 3D printed objects104. The print planner 210 may also add a marker 214 in the print plan204 on (or proximate) a surface of the 3D printing medium 102 to easethe identification of the unprinted area 212 after printing is complete.

It should be appreciated that only a single unprinted area 212 andassociated marker 214 is shown in FIG. 2 for clarity of illustration andthat any suitable number (e.g., one, two, three, four, five, six, seven,eight, ten, etc.) of unprinted area(s) 212 and/or associated marker(s)214 may be employed.

In some embodiments, the print orders 202 may be orders from one or morecustomers for particular objects to be printed. These print orders 202may be sent by customers to the computer system 206 over a network(e.g., the Internet) or in any other suitable way (e.g., a customer maycall the business operating the computer system 206 and place an orderduring the call, by mail, etc.). The print orders 202 may include, forexample, an indication of a 3D model to be printed, an address to whichthe resulting 3D printed object is to be shipped, and/or an indicationof a priority of the order (e.g., whether the order is a rush order).

In some embodiments, the print planner 210 may receive the print orders202 from customers and create the print plan 204 for the 3D printer 208that includes the objects identified in the print orders 202. The printplan 204 may include a set of instructions for the 3D printer 208 tofollow to print the appropriate 3D printed objects 104 in the 3Dprinting medium 102 to satisfy the received print orders 202. Forexample, the print plan 204 may specify the particular locations wherethe 3D printer 208 should fuse the 3D printing medium 102 in the frame100.

In some embodiments, the print planner 210 may create the print plan 204by identifying the dimensions of the frame 100 to determine the printingarea available for objects to be printed in the 3D printing medium 102.The print planner 210 may insert one or more unprinted areas 212 intothe available printing area. The unprinted areas 212 may be areas wherethe 3D printing medium 102 is purposefully left substantially (e.g., atleast 90%, at least 95%, at least 99%, at least 99.9%, 100%) unfused.The print planner 210 may determine the number, location, and dimensionsof these unprinted areas 212 based on various factors such as thedimensions of the frame 100, the desired cooling time of the printingmedium 102, the number of objects to be printed in the 3D printingmedium 102, and/or the size of the objects to be printed in the 3Dprinting medium 102. For example, the print planner 210 may pack theavailable printing area with objects to be printed and create a thermalmodel of the 3D printing medium 102 with the objects to be printed. Inthis example, the print planner 210 may receive a desired cooling timeand use the thermal model to identify an arrangement of unprinted areas212 to add to the print plan 210 to reduce an expected cooling time ofthe 3D printing medium 102 below the desired cooling time. In anotherexample, the print planner 210 may include a suggested arrangement ofunprinted areas 212 for each type of frame 100. In this example, theprint planner 210 may determine the type of frame 100 and add thesuggested arrangement of unprinted areas 212 to the print plan 204. Thesuggested arrangement of unprinted areas 212 may include more unprintedareas for larger size frames and evenly distribute the unprinted areasso as to achieve the desired cooling time for each type of frame 100.Once the suggested arrangement of unprinted areas 212 is added to theprint plan 204, the print planner 210 may pack the remaining availableprint space with objects from the print orders 202 to be printed.

As discussed above, the print planner 210 may determine the suggestedarrangement of unprinted areas 212 based on, for example, the dimension3D printing medium 102 to be cooled. Example arrangements of unprintedareas that may be employed by the print planner 210 are shown in FIGS.3A-3D by unprinted area arrangements 300A-300D, respectively. Each ofthe unprinted area arrangements 300A-300D are shown on a top surface ofthe 3D printing medium 102. The unprinted areas 212 in the unprintedarea arrangements 300A-300D may extend into the 3D printing medium 102(e.g., into the page in FIGS. 3A-3D) to form a column. A summary of theunprinted area arrangements 300A-300D in FIGS. 3A-3D, respectively, isshown below in Table 1.

TABLE 1 Example Arrangements of Unprinted Areas Size of 3D Number ofPrinting Unprinted Medium Areas Location of Unprinted Areas FIG. Small 1Place unprinted area at center of top FIG. surface of 3D printing medium3A Medium 2 Divide top surface of 3D printing FIG. medium into twosections (e.g., 3B halves) and place two unprinted areas along boundarybetween two sections Large 4 Divide top surface of 3D printing FIG.medium into four sections (e.g., 3C quadrants) and place one unprintedarea along each boundary between two of the four sections Large 4 Dividetop surface of 3D printing FIG. medium into four sections (e.g., 3Dquadrants) and place one unprinted area at the center of each section

FIG. 3A shows an example unprinted area arrangement 300A including onlya single unprinted area 212 located at a center of a top surface of the3D printing medium 102. The unprinted area arrangement 300A may beemployed by the print planner 210 to cool, for example, 3D printingmediums 102 with small dimensions where only a single cooling device isnecessary to cool the 3D printing medium 102 within the desired coolingtime.

FIG. 3B shows an example unprinted area arrangement 300B including twounprinted areas 212 located along a boundary 302 between two halves 304of the top surface of the 3D printing medium 102. The boundary 302 is ahorizontal line that divides the 3D printing medium 102 into two equalhalves 304. Each of the two unprinted areas 212 are placed along theboundary 302 and span both halves 304 of the top surface of the 3Dprinting medium 102. The unprinted areas 212 may be spaced apart on theboundary 302 so as to provide relatively uniform cooling to the 3Dprinting medium 102 when cooling devices are inserted into the unprintedareas 212. For example, the distance between the unprinted areas 212 onthe boundary 302 may be approximately equal (e.g., ±20%, ±10%, ±5%, or±2%) to twice the distance between the unprinted areas 212 and thenearest edge of the top surface of the 3D printing medium 102. Theunprinted area arrangement 300 B may be employed by the print planner210 to cool, for example, 3D printing mediums 102 with medium dimensionswhere two cooling devices are necessary to cool the 3D printing medium102 within the desired cooling time.

It should be appreciated that the boundary 302 may be drawn differentlyin the unprinted area arrangement 300 B to form two equal halves 302.For example, the boundary 302 may be drawn vertically across the topsurface of the 3D printing medium 102 and the unprinted areas 212 mayboth be located along the boundary 302 near a center of the top surfaceof the 3D printing medium 102. In another example, the boundary 302 maybe drawn diagonally across the top surface of the 3D printing medium 102and the unprinted areas 212 may be located proximate the corners of thetop surface of the 3D printing medium 102.

FIG. 3C shows an example unprinted area arrangement 300C including fourunprinted areas 212 located along boundaries 302 between four quadrants306 of the top surface of the 3D printing medium 102. The boundaries 302include a horizontal line and a vertical line that intersect to dividethe 3D printing medium 102 into four equal quadrants 306. Each of thefour unprinted areas 212 is placed along one of the boundaries 302 andspans two of the quadrants 306 of the top surface of the 3D printingmedium 102. The unprinted areas 212 may be spaced apart along theboundaries 302 so as to provide relatively uniform cooling to the 3Dprinting medium 102 when cooling devices are inserted into the unprintedareas 212. The unprinted area arrangement 300 C may be employed by theprint planner 210 to cool, for example, 3D printing mediums 102 withlarge dimensions where four cooling devices are necessary to cool the 3Dprinting medium 102 within the desired cooling time.

It should be appreciated that the unprinted areas 212 do not alwaysneeds to be placed along a boundary 302. For example as shown byarrangement 300D in FIG. 3D, an unprinted area 212 may be placed at acenter of each quadrant 306 away from the boundaries 302 on the topsurface of the 3D printing medium 102.

Returning to FIG. 2, the print planner 210 may insert markers 214 intothe print plan 204 on (or proximate) a surface 3D printing medium 102 toease identification of the unprinted areas 212 after printing in someembodiments. The markers 214 may be designed to have any of a variety ofshapes. For example, the markers 214 may be 3D printed gears with a holein the center.

In some embodiments, the print planner 210 may determine the arrangementof the 3D objects to be printed in the 3D printing medium 102 after theunprinted area 212 and/or the marker 214 has been added to the printplan 204. This may be done in any suitable way. In some embodiments, thearrangement the 3D objects in the print plan 204 may be determined usingsoftware (e.g., integrated into the print planner 210 or integrated intoanother application deployed locally on computer system 206 or remotely)for determining the packing of objects in a volume. For example, in someembodiments, the arrangement of the 3D objects may be determined usingthe AUTODESK® NETFABB® software deployed on the computer system 206 ordeployed remotely on another computer system.

In some embodiments, the print planner 210 may adjust the location ofone or more unprinted areas 212 in the 3D printing medium 102 to packone or more additional objects into the print plan 204. Theseadjustments to the location of the unprinted areas 212 may have minimal(if any) impact on the resulting cooling time of the 3D printing medium102. For example, shifting the location of an unprinted area in any ofFIGS. 3A-3D by an inch may have a negligible impact on the cooling timeof the 3D printing medium 102 and provide the benefit of allowinganother object to be included in the print plan 204. In theseembodiments, the print planner 210 may attempt to pack the objects fromthe print orders 202 into the available print space without adjustingthe location of the unprinted areas 212. The print planner 210 may thenattempt to fit additional objects from the print orders 202 into theprint plan by allowing one or more of the unprinted areas to be shiftedby up to a threshold distance (e.g., six inches) from their originallocation.

In some embodiments, the print planner 210 may prioritize objects fromcertain print orders 202 over others to include in the print plan 204.For example, the print planner 210 may receive print orders 202 forseven objects and determine that only six of the seven objects may beadded to the print plan 204. In this example, the print planner 210 maydetermine a priority for each of the objects to be printed and add theobjects with the highest priority to the print plan 204 while leavingthe lower priority objects to be added to a subsequent print plan 204.The print planner 210 may determine the priority of each object byreading priority information from the print orders 202. For example, theobjects from print orders 202 that include a “rush” designation mayreceive a higher priority than objects from other print orders 202.

It should be appreciated that, in some embodiments, any (or all) of thefunctions attributed to the print planner 210 may be performed with theassistance of an operator. For example, the print planner 210 may addthe unprinted areas 212 to the print plan 204 by displaying a visualrepresentation of the available printing area in the 3D printing medium102 to the operator and permitting the operator to designate areas asthe unprinted areas 212 in the visual representation of the availableprinting area.

In some embodiments, the print plan 204 may be a file including asequence of instructions (in any suitable format) for the 3D printer 208to print the appropriate 3D printed objects 104 in the 3D printingmedium 102 so as to fulfill one or more of the print orders 202. In someembodiments, the print plan 204 may not be sent directly from thecomputer system 206 to the 3D printer 208. For example, the print plan204 may be provided to a scheduling system (not shown) that monitors theavailability of a cluster of 3D printers 208. The scheduling system maydetermine whether any of the 3D printers 208 in the cluster areavailable and assign the print plan 204 to an available 3D printer 208.In other embodiments, the print plan 204 may be sent to 3D printer 208directly from computer system 206.

In some embodiments, the 3D printer 208 may receive the print plan 204and create the 3D printed objects 104 in the 3D printing medium 102using the instructions included in the print plan 204. The 3D printer208 may be any of a variety of types of 3D printers. For example, the 3Dprinter 208 may be an SLS printer.

After the 3D printed objects 104 have been printed in the frame 100, theframe 100 may be removed from the 3D printer 208 and cooled. In someembodiments, various cooling techniques may be employed to furtherreduce the cooling time before the cooling devices are inserted into theunprinted areas 212 of the 3D printing medium 102. For example, thecooling process may be expedited by removing the sidewalls 106 from theframe 100. The sidewalls 106 are typically constructed with a materialthat retains heat well such as a metal. Removing the sidewalls 106 fromthe frame 100 allows heat to more easily pass from the 3D printingmedium 102 to the ambient air. Further, the sidewalls 106 may be re-usedfor printing while the 3D printing medium 102 is cooling by attachingthe sidewalls 106 to a different tray 108 to form a new frame 100 andinserting the new frame 100 into the 3D printer 208. In another example,the 3D printing medium 102 may be compressed with a wrap to remove atleast a portion of the trapped air in the 3D printing medium 102. Thetrapped air is a good insulator that slows heat transfer between the 3Dprinting medium 102 and ambient air. Thereby, removal of the trapped airimproves heat transfer between the 3D printing medium 102 and theambient air. The wrap may be a plastic wrap such as a cellophane wrap.

As discussed above, cooling devices may be inserted into the unprintedareas 212 of the 3D printing medium 102 to expedite cooling. Thesecooling devices may form part of a cooling system. One illustrative ofsuch a cooling system is the cooling system 400 shown in FIG. 4. In theillustrated embodiment of FIG. 4, cooling system 400 includes one ormore cooling devices 402 that are inserted into the 3D printing medium,a refrigerator 406, and one or more coolant lines 404 fluidly couplingrefrigerator 406 to cooling devices 402. Relative to the frame 100 shownin FIG. 2, the sidewalls 106 have been removed, the 3D printing medium102 has been wrapped with a wrap 408 to compress the 3D printing medium102, the marker 214 has been removed from the 3D printing medium 102,and the cooling device 402 has been inserted into the 3D printing medium102 at the same point where the marker 214 was located. The coolingdevice 402 includes a tube 401 that circulates a fluid to cool the 3Dprinting medium 102. The cooling device 402 includes a handle 403 toease insertion of the cooling device 402 into the 3D printing medium102. The cooling system 400 also includes a brace 410 to guide insertionof the cooling device 402 into the 3D printing medium 102 that isapproximately perpendicular (e.g., ±20 degrees, ±10 degrees, ±5 degrees,or ±2 degrees) to the top surface of the 3D printing medium 102. Itshould be appreciated that only a single cooling device 402 in a singleunprinted area 212 is shown in FIG. 4 for clarity of illustration andthat any suitable number (e.g., one, two, three, four, five, six, seven,eight, ten, etc.) of cooling devices 402 and/or unprinted area(s) 212may be employed.

In some embodiments, the cooling device 402 may be configured to beinserted into the unprinted area 212 to cool the 3D printing medium 102.For example, the cooling device 402 may include a tube 401 thatpenetrates the 3D printing medium 102 and circulates a fluid that iscooler than the 3D printing medium 102. Thereby, heat may be transferredfrom the 3D printing medium 102 to the fluid in the tube 401. Thecooling device 402 may be configured to couple the tube 401 to thecoolant line 404 using, for example, one or more fittings to send thewarmed fluid to the refrigerator 406 and receive cool fluid from therefrigerator 406.

In some embodiments, the coolant line 404 may fluidly couple therefrigerator 406 to the cooling device 402. For example, the coolantline 404 may include a first tube that carries chilled fluid from therefrigerator 406 to the cooling device 402 and a second tube thatcarries warmed fluid from the cooling device 402 to the refrigerator406. The coolant line 404 may include one or more a tubes constructedfrom any of a variety of materials. For example, the tubes may be metaltubes, plastic tubes, and/or composite tubes. In some embodiments, atleast a portion of the coolant line 404 may be flexible.

For example, a portion of the coolant line 404 that is proximate thecooling device 402 may be flexible to allow easy insertion and removalof the cooling device 402 from the 3D printing medium 102 without movingthe 3D printing medium 102 and/or the refrigerator 406.

In some embodiments, the refrigerator 406 may be configured to cool thefluid received from the cooling device 402 and provide the chilled fluidto the cooling device 402. In some embodiments, the refrigerator 406 maycool the fluid using a heat exchanger that moves heat from the fluid tothe ambient air. In some embodiments, the refrigerator 406 may include apump that circulates the fluid through a radiator that transfers heatfrom the fluid to the ambient air. Additionally or alternatively, therefrigerator 406 may include a fan to move air across the radiator toincrease the cooling effect of the radiator.

In some embodiments, the refrigerator may include a compressor thatcompresses the received fluid and circulates the fluid through acondenser that converts the fluid from a gaseous state to a liquidstate. The condenser may convert the fluid from a gaseous state to aliquid state by transferring heat from the fluid to the ambient air.

The fluid employed in the cooling system 400 may take any of a varietyof forms. In some embodiments, the fluid may be a liquid coolant such asa mixture of water and propylene glycol. In another example, the fluidmay be a refrigerant that changes between a gaseous state and a liquidstate as the refrigerant moves between the refrigerator 406 and thecooling device 402.

FIG. 5 shows a detailed example of a cooling device 500 that may beemployed as cooling device 402 shown in FIG. 4. As shown, the coolingdevice 500 includes a handle 504 attached to a tube 502 including afirst tube portion 510, a second tube portion 512, and a bend 514 thatis approximately 180 degrees (e.g., ±20 degrees, ±10 degrees, ±5degrees, or ±2 degrees). The tube 502 may be coupled to a coolant line(e.g., coolant line 404 in FIG. 4) by first and second fittings 506 and508, respectively. For example, the first fitting 506 may couple thefirst tube portion 510 to a first tube of the coolant line to receivecool fluid. In this example, the second fitting 508 may couple thesecond tube portion 512 to a second tube of the coolant line to providewarm fluid.

In some embodiments, the first tube portion 510 may be twisted with thesecond tube portion 512 to form a spiral in the tube 502. Twisting thetube 502 in a spiral may add rigidity to the tube 502 to ease insertioninto the 3D printing medium without bending or otherwise damaging thetube 502. Twisting the tube 502 may also increase a surface area of thetube 502 that is in contact with the 3D printing medium to enhancecooling.

In some embodiments, the tube 502 and/or the first and second fittings506 and 508, respectively, may be formed from a metal such as copper,aluminum, titanium, and steel. For example, the tube 502 may be a coppertube with a diameter of approximately 0.25 inches (e.g., ±0.2 inches,±0.1 inches, ±0.05 inches, or ±0.01 inches) and the first and secondfittings 506 and 508, respectively, may also be formed from copper.

As discussed above, a cooling device may be inserted into an unprintedarea in the 3D printing medium to cool the 3D printing medium. Theinventors have appreciated that it may be difficult for an operator toinsert the cooling device into the 3D printing medium while keeping thecooling device approximately perpendicular (e.g., ±20 degrees, ±10degrees, ±5 degrees, or ±2 degrees) to the surface of the 3D printingmedium that the cooling device penetrated. Thereby, the operator mayinadvertently cause the cooling device to go outside the designatedunprinted area and potentially damage a 3D printed object in the 3Dprinting medium. Accordingly, the inventors have developed variousbraces to guide the insertion of the cooling device into the 3D printingmedium.

An illustrative example of such a brace is shown in FIGS. 6A and 6B bybrace 600. FIG. 6A shows a side-view of the brace 600 on the 3D printingmedium 102 and FIG. 6B shows a top-view of the brace 600 on the 3Dprinting medium 102. The brace 600 may be configured to rest against the3D printing medium 102 (or a wrap surrounding the 3D printing medium102) and guide the vertical insertion of a cooling device into the 3Dprinting medium 102. As shown, the brace 600 includes a flange 604 thatstabilizes the brace 600 against the 3D printing medium 102 and a guide602 with a hole 606 to receive the cooling device. In some embodiments,The guide 602 may be configured to receive the cooling device and guideinsertion of the cooling device into the 3D printing medium 102 at anangle that approximately perpendicular (e.g., ±20 degrees, ±10 degrees,±5 degrees, or ±2 degrees) to a surface of the 3D printing medium 102.The guide 602 may be, for example, cylindrical in shape with a hole 606at the center to permit entry of the cooling device. It should beappreciated that guide 602 is not limited to guiding only approximatelyperpendicular insertion of a cooling device into 3D printing medium 102and, in some embodiments, may be configured to receive the coolingdevice and guide its insertion in the 3D printing medium 102 at anyother suitable angle.

In some embodiments, the flange 604 may be configured to stabilize thebrace 600 against the 3D printing medium 102. In some embodiments, theflange 604 may be integral with the guide 602. The flange 604 may beconstructed as a disk with a hollow center that is wider than the guide606. The flange 604 may be made from rubber, plastic, or any othersuitable material(s).

FIGS. 7A and 7B show another example brace 700. FIG. 7A shows aside-view of the brace 700 on the 3D printing medium 102 and FIG. 7Bshows a top-view of the brace 700 on the 3D printing medium 102. Thebrace 700 may be configured to guide horizontal insertion of two coolingdevices into the 3D printing medium 102. As shown, the brace 700includes two guides 702 each with a hole 706 to permit insertion of acooling device. A bridge 704 connects the two guides 702 together andalso connects the guides 702 to a stand 708. The stand 708 may rest on ashelf or other flat surface to hold the guides 702 at the appropriatedistances above the bottom of the 3D printing medium 102. The guides 702may be integral with the bridge 704 and/or the stand 708.

As discussed above, the cooling techniques disclosed herein may beemployed to reduce the cooling time in 3D printed object manufacturingprocesses such as, for example, processes employed by providers ofon-demand printing services. An example 3D printed object manufacturingprocess 800A employing various cooling techniques disclosed herein isshown in FIG. 8A. Process 800A may be performed at least in part byusing print order processing system 200 and cooling system 400 describedwith reference to FIG. 2 and FIG. 4, respectively.

As shown, the 3D printed object manufacturing process 800A includes aplan generation phase 801 where a print plan is generated, a printingphase 803 where 3D objects are printed in accordance with the printplan, and a cooling phase 805 where the 3D printing medium with the 3Dprinted objects is cooled. The plan generation phase 801 includes an act802 of identifying unprinted area(s) and an act 804 of determining where3D objects are to be printed. The printing phase 803 includes an act 806of printing the 3D objects. The cooling phase 805 includes an act 808 ofinserting cooling device(s) into the 3D printing medium and an act 810of cooling the 3D printing medium.

In act 802, unprinted area(s) are identified to permit the insertion ofcooling device(s) into the resulting 3D printing medium without damaging3D printed objects in the 3D printing medium. The identified unprintedarea(s) may be added to a print plan for a 3D printer, such as an SLSprinter. The unprinted area(s) may be identified by, for example, aprint planner application (e.g., print planner 210) executed on acomputer system (e.g., computer system 206). The number and/or locationof the unprinted area(s) may be determined based on various parameterssuch as the dimensions of the 3D printing medium to be cooled, a desiredcooling time, a size of the cooling device(s) to be inserted into the 3Dprinting medium, and/or a number of objects to be printed in the 3Dprinting medium. In some embodiments, the number of unprinted area(s)may be increased as the size of the 3D printing medium increases tomaintain a constant or similar cooling time across 3D printing media ofdifferent sizes. Further, the unprinted area(s) may be evenly spaced tocool the 3D printing medium in a more uniform fashion. For example, the3D printing medium may require four unprinted areas to be inserted intothe cooling medium to achieve a desired cooling time. In this example, asurface of the 3D printing medium may be divided into four quadrants andeach of the four unprinted areas may be located at a boundary betweentwo of the four quadrants.

In some embodiments, markers may be added to print plan to mark thelocation of the unprinted areas. For example, a marker object may beadded to the print plan that is to be printed at (or proximate) asurface of the 3D printing medium to mark an access point to theunprinted area. In this example, subsequent identification of the accesspoint to the unprinted area may be performed by locating the marker onthe surface of the 3D printing medium.

In act 804, the locations where the 3D objects are to be printed in the3D printing medium are determined and added to the print plan. Thelocations may be identified by, for example, a print planner application(e.g., print planner 210) executed on a computer system (e.g., computersystem 206). In some embodiments, the locations may be identified bysuch that none of the 3D objects intersect the unprinted areasidentified in act 802. It should be appreciated that the location of theunprinted areas may be adjusted to permit additional objects to beprinted in the 3D printing medium. For example, the unprinted areas maybe permitted to be shifted by up to a maximum distance from theiroriginal location (e.g., five inches) if the resulting shift allows forat least one additional object to be added to the print plan. Once theobjects have been added to the print plan, the print plan may be sent toa 3D printer.

In act 806, 3D objects may be printed by a 3D printer in accordance witha print plan. For example, an SLS printer may receive the print plan andfuse portions of a 3D printing medium together to form the 3D objects ina 3D printing medium identified in the print plan.

In act 808, cooling device(s) may be inserted into the unprinted area(s)in the 3D printing medium. In some embodiments, the unprinted area(s)may be identified by locating the marker(s) on the surface of the 3Dprinting medium. Once the locations of the unprinted area(s) have beenidentified, braces may be placed on the 3D printing medium over theunprinted area(s) to guide insertion of the cooling device(s). Then, thecooling device(s) may be inserted into the 3D printing medium throughthe braces at an angle that is approximately perpendicular (e.g., ±20degrees, ±10 degrees, ±5 degrees, or ±2 degrees) to a surface of the 3Dprinting medium that the cooling device(s) penetrated.

In act 810, the 3D printing medium may be cooled using the insertedcooling device(s). For example, fluid may be circulated through theinserted cooling device to extract heat from the 3D printing medium.

It should be appreciated that various alterations may be made to the 3Dprinted object manufacturing process 800A without departing from thescope of the present disclosure. For example, the 3D printing medium maybe wrapped between the printing in act 806 and the insertion of thecooling device(s) in act 808. Wrapping the 3D printing medium maycompress the 3D printing medium to remove some of the air trapped in the3D printing medium and, thereby, improve heat transfer between the 3Dprinting medium and the ambient air. An example of such a 3D printedobject manufacturing process is shown in FIG. 8B by the 3D printedobject manufacturing process 800B. The 3D printed object manufacturingprocess 800B adds an act 812 of wrapping the 3D printing medium in thecooling phase 805 relative to the 3D printed object manufacturingprocess 800A.

In act 812, the 3D printing medium may be wrapped with a wrap. Forexample, any enclosure that covers the sides of the 3D printing medium(e.g., sidewalls 106 in FIG. 1) may be removed to expose the 3D printingmedium. Once the 3D printing medium has been exposed, the 3D printingmedium may be wrapped with a wrap such as a cellophane wrap to compressthe 3D printing medium. It should be appreciated that the entire 3Dprinting medium or any portion of the 3D printing medium may be wrapped.

As discussed above, cooling devices may be configured for insertion intothe 3D printing medium to expedite cooling of the 3D printing medium. Anexample of such a cooling device is described with reference to FIG. 5that includes a tube that is twisted in a spiral shape with a bend inthe center that is approximately 180 degrees (e.g., ±20 degrees, ±10degrees, ±5 degrees, or ±2 degrees). An example cooling devicemanufacturing process to manufacture the cooling device 500 shown inFIG. 5 is shown in FIG. 9 by the cooling device manufacturing process900. As shown, the cooling device manufacturing process 900 includes anact 902 of receiving a tube, an act 904 of bending the tubeapproximately 180 degrees, an act 906 of twisting the tube, and an act908 of attaching the handle.

In act 902, a tube may be received. The tube may be a straight tubeconstructed from a metal such as copper, aluminum, and steel. Forexample, the tube may be a straight copper tube with a diameter ofapproximately 0.25 inches (e.g., ±0.2 inches, ±0.1 inches, ±0.05 inches,or ±0.01 inches). It should be appreciated that the particularconstruction of the tube may vary based on the particularimplementation.

In act 904, the tube may be bent by approximately 180 degrees (e.g., ±20degrees, ±10 degrees, ±5 degrees, or ±2 degrees). The bend may be addedto the tube at approximately a center of the tube. In some embodiments,the bend may be added to the tube in a multi-step process to reduce thepossibility of the tube collapsing at the bend. For example, the tubemay be bent approximately 90 degrees (e.g., ±10 degrees, ±5 degrees,±2.5 degrees, or ±1 degree) and water may be added to the tube to fillthe bend. In this example, the water in the bend may be frozen beforefurther bending the tube to achieve a bend of approximately 180 degrees(e.g., ±20 degrees, ±10 degrees, ±5 degrees, or ±2 degrees).

In act 906, the tube may be twisted. For example, the bend in the tubemay be locked in a vice-grip and the ends of the tube may be twistedwith each other to form a spiral. In this example, the spiral shape maybe locked into the tube by heating the twisted tube and melting solderonto the twisted tube.

In act 908, a handle may be attached to the tube. For example, thehandle may include an undersized receptacle to receive a portion of thetube that is pressed onto the tube to form a force fit. In anotherexample, the handle may include an adjustable clamp mechanism that maybe loosened to receive a portion of the tube and tightened to lock thetube in place.

The processes described above are illustrative embodiments and are notintended to limit the scope of the present disclosure. The acts in theprocesses described above may be ordered in any suitable way.Accordingly, embodiments may be constructed in which acts are performedin an order different than illustrated, which may include performingsome acts simultaneously, even though shown as sequential acts inillustrative embodiments.

In some embodiments, a special-purpose computer system (e.g., computersystem 206 shown in FIG. 2) can be specially configured to generate aprint plan based on received print orders through, for example, theinstallation of a print planner computer program as described herein.FIG. 10 shows a block diagram of an example special-purpose computersystem 1000 which may perform various processes described hereinincluding, for example, the acts in the plan generation phase 801 of themanufacturing processes illustrated above in FIGS. 8A and 8B. As shownin FIG. 10, the computer system 1000 includes a processor 1006 connectedto a memory device 1010 and a storage device 1012. The processor 1006may manipulate data within the memory 1010 and copy the data to storage1012 after processing is completed. The memory 1010 may be used forstoring programs and data during operation of the computer system 1000.Storage 1012 may include a computer readable and writeable nonvolatilerecording medium in which computer executable instructions are storedthat define a program to be executed by the processor 1006. According toone embodiment, storage 1012 comprises a non-transient storage medium(e.g., a non-transitory computer readable medium) on which computerexecutable instructions are retained.

Components of computer system 1000 can be coupled by an interconnectionmechanism 1008, which may include one or more busses (e.g., betweencomponents that are integrated within a same machine) and/or a network(e.g., between components that reside on separate discrete machines).The interconnection mechanism enables communications (e.g., data,instructions) to be exchanged between system components of system 1000.The computer system 1000 may also include one or more input/output (I/O)devices 1002 and 1004, for example, a keyboard, mouse, trackball,microphone, touch screen, a printing device, display screen, speaker,etc. to facilitate communication with other systems and/or a user.

The computer system 1000 may include specially-programmed,special-purpose hardware, for example, an application-specificintegrated circuit (ASIC). Aspects of the present disclosure can beimplemented in software, hardware or firmware, or any combinationthereof. Although computer system 1000 is shown by way of example, asone type of computer system upon which various aspects of the presentdisclosure can be practiced, it should be appreciated that aspects ofthe present disclosure are not limited to being implemented on thecomputer system as shown in FIG. 10. Various aspects of the presentdisclosure can be practiced on one or more computers having a differentarchitectures or components than that shown in FIG. 10.

Various embodiments described above can be implemented using anobject-oriented programming language, such as Java, C++, Ada, or C#(C-Sharp). Other programming languages may also be used. Alternatively,functional, scripting, and/or logical programming languages can be used.Various aspects of the present disclosure can be implemented in anon-programmed environment (e.g., documents created in HTML, XML orother format that, when viewed in a window of a browser program, renderaspects of a graphical-user interface (GUI) or perform other functions).The system libraries of the programming languages are incorporatedherein by reference. Various aspects of the present disclosure can beimplemented as programmed or non-programmed elements, or any combinationthereof.

It should be appreciated that various embodiments can be implemented bymore than one computer system. For instance, the system can be adistributed system (e.g., client server, multi-tier system) thatincludes multiple special-purpose computer systems. These systems can bedistributed among a communication system such as the Internet.

Various aspects of the present disclosure may be used alone, incombination, or in a variety of arrangements not specifically discussedin the embodiments described in the foregoing and is therefore notlimited in its application to the details and arrangement of componentsset forth in the foregoing description or illustrated in the drawings.For example, aspects described in one embodiment may be combined in anymanner with aspects described in other embodiments.

Further, some actions are described as taken by a “user” or “operator.”It should be appreciated that a “user” or “operator” need not be asingle individual, and that in some embodiments, actions attributable toa “user” may be performed by a team of individuals and/or an individualin combination with computer-assisted tools or other mechanisms.

Use of ordinal terms such as “first,” “second,” “third,” etc., in theclaims to modify a claim element does not by itself connote anypriority, precedence, or order of one claim element over another or thetemporal order in which acts of a method are performed, but are usedmerely as labels to distinguish one claim element having a certain namefrom another element having a same name (but for use of the ordinalterm) to distinguish the claim elements.

The terms “approximately” and “about” may be used to mean within ±20% ofa target value in some embodiments, within ±10% of a target value insome embodiments, within ±5% of a target value in some embodiments, andyet within ±2% of a target value in some embodiments. The terms“approximately” and “about” may include the target value.

Also, the phraseology and terminology used herein is for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having,” “containing,” “involving,” andvariations thereof herein, is meant to encompass the items listedthereafter and equivalents thereof as well as additional items.

Having described above several aspects of at least one embodiment, it isto be appreciated various alterations, modifications, and improvementswill readily occur to those skilled in the art. For example, the coolingtechniques may be used in conjunction with other additive 3D printingtechniques. Such alterations, modifications, and improvements areintended to be object of this disclosure. Accordingly, the foregoingdescription and drawings are by way of example only.

What is claimed is:
 1. A method of manufacturing three-dimensional ( 3D)objects, the method comprising: generating a plan for printing aplurality of 3D objects in a 3D printing medium, prior to printing anyof the plurality of 3D objects; printing, using a 3D printer, at leastsome of the plurality of 3D objects in the 3D printing medium inaccordance with the generated plan; after printing the at least some ofthe plurality of 3D objects in the 3D printing medium, cooling the 3Dprinting medium, the cooling comprising: inserting a cooling device intoan unprinted region of the 3D printing medium, the cooling deviceconfigured to remove heat from the 3D printing medium via a fluid; andcirculating the fluid through the cooling device while the coolingdevice is inserted in the unprinted region of the 3D printing medium;and after cooling the 3D printing medium, removing the at least some ofthe plurality of 3D objects from the 3D printing medium.
 2. The methodof claim 1, wherein inserting the cooling device into the unprinted areaof the 3D printing medium comprises inserting the cooling device througha brace, separate from the cooling device, to guide insertion of thecooling device into the 3D printing medium.
 3. The method of claim 2,wherein inserting the cooling device through the brace comprisesinserting the cooling device through the brace in one of a substantiallyvertical position and a substantially horizontal position in the 3Dprinting medium.
 4. The method of claim 1, wherein the cooling devicecomprises a plurality of probes, and wherein inserting the coolingdevice comprises inserting the plurality of probes into a respectiveplurality of unprinted regions of the 3D printing medium.
 5. The methodof claim 4, wherein inserting the cooling device comprises inserting theplurality of probes through a respective plurality of braces, separatefrom the cooling device, to guide insertion of the plurality of probesinto the 3D printing medium.
 6. The method of claim 5, wherein theplurality of probes comprises two probes, and inserting the plurality ofprobes through a respective plurality of braces comprises inserting twoprobes through respective two braces in a horizontal position in the 3Dprinting medium.
 7. The method of claim 4, wherein circulating the fluidthrough the cooling device while the cooling device is inserted in theunprinted region of the 3D printing medium comprises circulating thefluid through each probe of the plurality of probes.
 8. The method ofclaim 7, wherein each probe comprises a tube, and wherein circulatingthe fluid through each probe of the plurality of probes comprisesflowing the fluid into a first portion of the tube from a refrigeratorand flowing the fluid out of a second portion of the tube to provide thefluid to the refrigerator.
 9. The method of claim 7, wherein circulatingthe fluid comprises circulating a liquid including water, propyleneglycol, or water and propylene glycol.
 10. The method of claim 1, thecooling further comprising, prior to inserting the cooling device intothe unprinted region of the 3D printing medium, wrapping the 3D printingmedium with a plastic wrap.
 11. A method of manufacturingthree-dimensional ( 3D) objects, the method comprising: printing, usinga 3D printer, a plurality of 3D objects in a 3D printing medium inaccordance with a previously generated plan for printing the pluralityof 3D objects in the 3D printing medium; after printing the plurality of3D objects in the 3D printing medium, cooling the 3D printing medium,the cooling comprising: inserting a cooling device into an unprintedregion of the 3D printing medium through a brace coupled to the 3Dprinting medium, the cooling device configured to remove heat from the3D printing medium via a fluid; fluidly coupling the cooling device to arefrigerator configured to cool the fluid; and circulating the fluidthrough the cooling device while the cooling device is inserted in theunprinted region of the 3D printing medium; and after cooling the 3Dprinting medium, removing the plurality of 3D objects from the 3Dprinting medium.
 12. The method of claim 11, wherein the cooling devicecomprises a plurality of probes, and wherein inserting the coolingdevice comprises inserting the plurality of probes into a respectiveplurality of unprinted regions of the 3D printing medium through arespective plurality of braces.
 13. The method of claim 12, whereininserting the cooling device through the brace comprises inserting twoprobes through a respective two braces in a horizontal position in the3D printing medium.
 14. The method of claim 12, wherein circulating thefluid through the cooling device while the cooling device is inserted inthe unprinted region of the 3D printing medium comprises circulating thefluid through each probe of the plurality of probes.
 15. The method ofclaim 14, wherein each probe comprises a tube, and wherein circulatingthe fluid through each probe of the plurality of probes comprisesflowing the fluid into a first portion of the tube from the refrigeratorand flowing the fluid out of a second portion of the tube to provide thefluid to the refrigerator.
 16. The method of claim 14, wherein eachprobe comprises a tube, and circulating the fluid through each probe ofthe plurality of probes comprises circulating the fluid through a bendin the tube, the bend being approximately 180 degrees.
 17. The method ofclaim 14, wherein each probe comprises a tube, and circulating the fluidthrough each probe comprises circulating the fluid through a tubecomprising copper and having a diameter of approximately 0.25 inches.18. The method of claim 11, wherein inserting the cooling device throughthe brace comprises inserting the cooling device in one of asubstantially vertical position and a substantially horizontal positionin the 3D printing medium.
 19. The method of claim 11, whereincirculating the fluid comprises circulating a liquid including water,propylene glycol, or water and propylene glycol.
 20. The method of claim11, the cooling further comprising, prior to inserting the coolingdevice into the unprinted region of the 3D printing medium, wrapping the3D printing medium with a plastic wrap.